What would be the major product,A,of the following reaction? 
Definitions:
Neuromodulators
Substances released by neurons in the nervous system that influence the strength or weakness of the signal being transmitted, altering the activity of other neurons or muscles.
Synaptic Transmission
The process by which nerve impulses are transmitted across a synapse from one neuron to another.
Neurotransmitter Receptor
A specialized protein on the surface of a cell, designed to bind with specific neurotransmitters to induce changes within the cell.
Neurotransmitter
Chemicals that transmit signals across a synapse from one neuron to another in the nervous system.
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